1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/device.h> 3 #include <linux/err.h> 4 #include <linux/io.h> 5 #include <linux/gfp.h> 6 #include <linux/export.h> 7 #include <linux/of_address.h> 8 9 enum devm_ioremap_type { 10 DEVM_IOREMAP = 0, 11 DEVM_IOREMAP_UC, 12 DEVM_IOREMAP_WC, 13 DEVM_IOREMAP_NP, 14 }; 15 16 void devm_ioremap_release(struct device *dev, void *res) 17 { 18 iounmap(*(void __iomem **)res); 19 } 20 21 static int devm_ioremap_match(struct device *dev, void *res, void *match_data) 22 { 23 return *(void **)res == match_data; 24 } 25 26 static void __iomem *__devm_ioremap(struct device *dev, resource_size_t offset, 27 resource_size_t size, 28 enum devm_ioremap_type type) 29 { 30 void __iomem **ptr, *addr = NULL; 31 32 ptr = devres_alloc_node(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL, 33 dev_to_node(dev)); 34 if (!ptr) 35 return NULL; 36 37 switch (type) { 38 case DEVM_IOREMAP: 39 addr = ioremap(offset, size); 40 break; 41 case DEVM_IOREMAP_UC: 42 addr = ioremap_uc(offset, size); 43 break; 44 case DEVM_IOREMAP_WC: 45 addr = ioremap_wc(offset, size); 46 break; 47 case DEVM_IOREMAP_NP: 48 addr = ioremap_np(offset, size); 49 break; 50 } 51 52 if (addr) { 53 *ptr = addr; 54 devres_add(dev, ptr); 55 } else 56 devres_free(ptr); 57 58 return addr; 59 } 60 61 /** 62 * devm_ioremap - Managed ioremap() 63 * @dev: Generic device to remap IO address for 64 * @offset: Resource address to map 65 * @size: Size of map 66 * 67 * Managed ioremap(). Map is automatically unmapped on driver detach. 68 */ 69 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, 70 resource_size_t size) 71 { 72 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP); 73 } 74 EXPORT_SYMBOL(devm_ioremap); 75 76 /** 77 * devm_ioremap_uc - Managed ioremap_uc() 78 * @dev: Generic device to remap IO address for 79 * @offset: Resource address to map 80 * @size: Size of map 81 * 82 * Managed ioremap_uc(). Map is automatically unmapped on driver detach. 83 */ 84 void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset, 85 resource_size_t size) 86 { 87 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_UC); 88 } 89 EXPORT_SYMBOL_GPL(devm_ioremap_uc); 90 91 /** 92 * devm_ioremap_wc - Managed ioremap_wc() 93 * @dev: Generic device to remap IO address for 94 * @offset: Resource address to map 95 * @size: Size of map 96 * 97 * Managed ioremap_wc(). Map is automatically unmapped on driver detach. 98 */ 99 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset, 100 resource_size_t size) 101 { 102 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_WC); 103 } 104 EXPORT_SYMBOL(devm_ioremap_wc); 105 106 /** 107 * devm_iounmap - Managed iounmap() 108 * @dev: Generic device to unmap for 109 * @addr: Address to unmap 110 * 111 * Managed iounmap(). @addr must have been mapped using devm_ioremap*(). 112 */ 113 void devm_iounmap(struct device *dev, void __iomem *addr) 114 { 115 WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match, 116 (__force void *)addr)); 117 iounmap(addr); 118 } 119 EXPORT_SYMBOL(devm_iounmap); 120 121 static void __iomem * 122 __devm_ioremap_resource(struct device *dev, const struct resource *res, 123 enum devm_ioremap_type type) 124 { 125 resource_size_t size; 126 void __iomem *dest_ptr; 127 char *pretty_name; 128 129 BUG_ON(!dev); 130 131 if (!res || resource_type(res) != IORESOURCE_MEM) { 132 dev_err(dev, "invalid resource %pR\n", res); 133 return IOMEM_ERR_PTR(-EINVAL); 134 } 135 136 if (type == DEVM_IOREMAP && res->flags & IORESOURCE_MEM_NONPOSTED) 137 type = DEVM_IOREMAP_NP; 138 139 size = resource_size(res); 140 141 if (res->name) 142 pretty_name = devm_kasprintf(dev, GFP_KERNEL, "%s %s", 143 dev_name(dev), res->name); 144 else 145 pretty_name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL); 146 if (!pretty_name) { 147 dev_err(dev, "can't generate pretty name for resource %pR\n", res); 148 return IOMEM_ERR_PTR(-ENOMEM); 149 } 150 151 if (!devm_request_mem_region(dev, res->start, size, pretty_name)) { 152 dev_err(dev, "can't request region for resource %pR\n", res); 153 return IOMEM_ERR_PTR(-EBUSY); 154 } 155 156 dest_ptr = __devm_ioremap(dev, res->start, size, type); 157 if (!dest_ptr) { 158 dev_err(dev, "ioremap failed for resource %pR\n", res); 159 devm_release_mem_region(dev, res->start, size); 160 dest_ptr = IOMEM_ERR_PTR(-ENOMEM); 161 } 162 163 return dest_ptr; 164 } 165 166 /** 167 * devm_ioremap_resource() - check, request region, and ioremap resource 168 * @dev: generic device to handle the resource for 169 * @res: resource to be handled 170 * 171 * Checks that a resource is a valid memory region, requests the memory 172 * region and ioremaps it. All operations are managed and will be undone 173 * on driver detach. 174 * 175 * Usage example: 176 * 177 * res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 178 * base = devm_ioremap_resource(&pdev->dev, res); 179 * if (IS_ERR(base)) 180 * return PTR_ERR(base); 181 * 182 * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code 183 * on failure. 184 */ 185 void __iomem *devm_ioremap_resource(struct device *dev, 186 const struct resource *res) 187 { 188 return __devm_ioremap_resource(dev, res, DEVM_IOREMAP); 189 } 190 EXPORT_SYMBOL(devm_ioremap_resource); 191 192 /** 193 * devm_ioremap_resource_wc() - write-combined variant of 194 * devm_ioremap_resource() 195 * @dev: generic device to handle the resource for 196 * @res: resource to be handled 197 * 198 * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code 199 * on failure. 200 */ 201 void __iomem *devm_ioremap_resource_wc(struct device *dev, 202 const struct resource *res) 203 { 204 return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC); 205 } 206 207 /* 208 * devm_of_iomap - Requests a resource and maps the memory mapped IO 209 * for a given device_node managed by a given device 210 * 211 * Checks that a resource is a valid memory region, requests the memory 212 * region and ioremaps it. All operations are managed and will be undone 213 * on driver detach of the device. 214 * 215 * This is to be used when a device requests/maps resources described 216 * by other device tree nodes (children or otherwise). 217 * 218 * @dev: The device "managing" the resource 219 * @node: The device-tree node where the resource resides 220 * @index: index of the MMIO range in the "reg" property 221 * @size: Returns the size of the resource (pass NULL if not needed) 222 * 223 * Usage example: 224 * 225 * base = devm_of_iomap(&pdev->dev, node, 0, NULL); 226 * if (IS_ERR(base)) 227 * return PTR_ERR(base); 228 * 229 * Please Note: This is not a one-to-one replacement for of_iomap() because the 230 * of_iomap() function does not track whether the region is already mapped. If 231 * two drivers try to map the same memory, the of_iomap() function will succeed 232 * but the devm_of_iomap() function will return -EBUSY. 233 * 234 * Return: a pointer to the requested and mapped memory or an ERR_PTR() encoded 235 * error code on failure. 236 */ 237 void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index, 238 resource_size_t *size) 239 { 240 struct resource res; 241 242 if (of_address_to_resource(node, index, &res)) 243 return IOMEM_ERR_PTR(-EINVAL); 244 if (size) 245 *size = resource_size(&res); 246 return devm_ioremap_resource(dev, &res); 247 } 248 EXPORT_SYMBOL(devm_of_iomap); 249 250 #ifdef CONFIG_HAS_IOPORT_MAP 251 /* 252 * Generic iomap devres 253 */ 254 static void devm_ioport_map_release(struct device *dev, void *res) 255 { 256 ioport_unmap(*(void __iomem **)res); 257 } 258 259 static int devm_ioport_map_match(struct device *dev, void *res, 260 void *match_data) 261 { 262 return *(void **)res == match_data; 263 } 264 265 /** 266 * devm_ioport_map - Managed ioport_map() 267 * @dev: Generic device to map ioport for 268 * @port: Port to map 269 * @nr: Number of ports to map 270 * 271 * Managed ioport_map(). Map is automatically unmapped on driver 272 * detach. 273 * 274 * Return: a pointer to the remapped memory or NULL on failure. 275 */ 276 void __iomem *devm_ioport_map(struct device *dev, unsigned long port, 277 unsigned int nr) 278 { 279 void __iomem **ptr, *addr; 280 281 ptr = devres_alloc_node(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL, 282 dev_to_node(dev)); 283 if (!ptr) 284 return NULL; 285 286 addr = ioport_map(port, nr); 287 if (addr) { 288 *ptr = addr; 289 devres_add(dev, ptr); 290 } else 291 devres_free(ptr); 292 293 return addr; 294 } 295 EXPORT_SYMBOL(devm_ioport_map); 296 297 /** 298 * devm_ioport_unmap - Managed ioport_unmap() 299 * @dev: Generic device to unmap for 300 * @addr: Address to unmap 301 * 302 * Managed ioport_unmap(). @addr must have been mapped using 303 * devm_ioport_map(). 304 */ 305 void devm_ioport_unmap(struct device *dev, void __iomem *addr) 306 { 307 ioport_unmap(addr); 308 WARN_ON(devres_destroy(dev, devm_ioport_map_release, 309 devm_ioport_map_match, (__force void *)addr)); 310 } 311 EXPORT_SYMBOL(devm_ioport_unmap); 312 #endif /* CONFIG_HAS_IOPORT_MAP */ 313 314 static void devm_arch_phys_ac_add_release(struct device *dev, void *res) 315 { 316 arch_phys_wc_del(*((int *)res)); 317 } 318 319 /** 320 * devm_arch_phys_wc_add - Managed arch_phys_wc_add() 321 * @dev: Managed device 322 * @base: Memory base address 323 * @size: Size of memory range 324 * 325 * Adds a WC MTRR using arch_phys_wc_add() and sets up a release callback. 326 * See arch_phys_wc_add() for more information. 327 */ 328 int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size) 329 { 330 int *mtrr; 331 int ret; 332 333 mtrr = devres_alloc_node(devm_arch_phys_ac_add_release, sizeof(*mtrr), GFP_KERNEL, 334 dev_to_node(dev)); 335 if (!mtrr) 336 return -ENOMEM; 337 338 ret = arch_phys_wc_add(base, size); 339 if (ret < 0) { 340 devres_free(mtrr); 341 return ret; 342 } 343 344 *mtrr = ret; 345 devres_add(dev, mtrr); 346 347 return ret; 348 } 349 EXPORT_SYMBOL(devm_arch_phys_wc_add); 350 351 struct arch_io_reserve_memtype_wc_devres { 352 resource_size_t start; 353 resource_size_t size; 354 }; 355 356 static void devm_arch_io_free_memtype_wc_release(struct device *dev, void *res) 357 { 358 const struct arch_io_reserve_memtype_wc_devres *this = res; 359 360 arch_io_free_memtype_wc(this->start, this->size); 361 } 362 363 /** 364 * devm_arch_io_reserve_memtype_wc - Managed arch_io_reserve_memtype_wc() 365 * @dev: Managed device 366 * @start: Memory base address 367 * @size: Size of memory range 368 * 369 * Reserves a memory range with WC caching using arch_io_reserve_memtype_wc() 370 * and sets up a release callback See arch_io_reserve_memtype_wc() for more 371 * information. 372 */ 373 int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start, 374 resource_size_t size) 375 { 376 struct arch_io_reserve_memtype_wc_devres *dr; 377 int ret; 378 379 dr = devres_alloc_node(devm_arch_io_free_memtype_wc_release, sizeof(*dr), GFP_KERNEL, 380 dev_to_node(dev)); 381 if (!dr) 382 return -ENOMEM; 383 384 ret = arch_io_reserve_memtype_wc(start, size); 385 if (ret < 0) { 386 devres_free(dr); 387 return ret; 388 } 389 390 dr->start = start; 391 dr->size = size; 392 devres_add(dev, dr); 393 394 return ret; 395 } 396 EXPORT_SYMBOL(devm_arch_io_reserve_memtype_wc); 397